What are the workflow of bottle blowing machine?

In the process of bottle blowing, there are three actions: stretching-pre-blowing-bottle blowing. The time of the three actions is very short, but they must be well coordinated, especially the first two steps determine the overall distribution of materials and the quality of bottle blowing. Therefore, it is necessary to adjust the drawing start time, drawing speed, pre-blowing stop time, pre-blowing pressure and pre-blowing flow rate. If possible, it is best to control the overall temperature distribution of the bottle blank and the temperature gradient of the inner and outer walls of the bottle blank. In the process of rapid bottle blowing and cooling, the bottle wall will produce induced stress. For aerated beverage bottles, it is beneficial to resist internal pressure, but for hot-filled bottles, it is necessary to ensure full release above the glass transition temperature. Blowing bottles is carried out between vitrification temperature and crystallization temperature, which is generally controlled between 90 ~ 120 degrees. In this region, PET shows a high elastic state and becomes a transparent bottle after rapid molding and cooling solidification.

The bottle blowing process is a two-way stretching process. In this process, the PET chains are bidirectionally extended and directionally arranged, which improves the mechanical properties, tensile strength, tensile strength and impact strength of the bottle wall and has good air tightness. Although stretching helps to improve the strength, it should not be overstretched, and the ratio of stretching to expansion should be well controlled: not more than 3.5 ~ 4.2 in radial direction and 2.8 ~ 3. 1 in axial direction. The wall thickness of the bottle blank should not exceed 4.5 mm. The tubular plastic parison obtained by extrusion or injection molding of plastic resin is put into a split mold while it is hot (or heated to a softened state), and compressed air is introduced into the parison immediately after closing the mold, so that the plastic parison expands and adheres to the inner wall of the mold, and various hollow products are obtained after cooling and demoulding. The plastic is melted in the screw extruder and quantitatively extruded, then molded by the orifice film, cooled by the wind ring blowing, pulled by the tractor at a certain speed, and wound into a coil by the winder. The bottle blowing machine sales platform specializes in producing and selling plastic machinery, bottle blowing machines, bottle blowing machines, automatic bottle blowing machines and barrel blowing machines.